[Eeglablist] PCA preclustering

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue Feb 18 14:19:46 PST 2014

Dear Shiri,

Sorry for slow response. The warning message means that if you separate the
within-subject conditions into different set files, they should share the
identical ICA weight matrix. This also means that ICA should be run on the
condition-unseparated data, and you should not run ICA on different
within-subject conditions. Please check if it holds in your case.


2014-01-31 14:00 GMT-08:00 Shiri Simon <shirisimon85 at gmail.com>:

> Dear EEGLAB Team,
> I'm interested in performing clustering to ICs based on ERSPs and scalp
> maps.
> I run the pop_precomp() while checking these options.
> After that, when I call for the pop_preclust, I get poping window saying I
> "can use only dipole or scalp map clustering. This is because some datasets
> do not have ICA pairs. look for NaN values in STUDY.cluster.set...."
> I don't understand that message. What does it mean ICA pairs? and What the
> cluster.sets field mean?
> As far as I can tell no datasets are missing.
> Thank you very much in advance for your help.
> Best regards
> Shiri Simon
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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